/* ============================================================
   Jonathan Fang — portfolio redesign
   Inspired by p5aholic.me: full-bleed particle field, thin inset
   frame with perimeter labels, text-index navigation.
   ============================================================ */

:root {
    --frame-inset: 18px;
    --frame-pad: 30px; /* gap between frame line and content */
    --font-display: 'EB Garamond', Georgia, serif;
    --font-mono: 'Space Mono', 'Courier New', monospace;
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

body {
    --bg: #f2f0ea;
    --ink: #1c1b18;
    --muted: rgba(28, 27, 24, 0.55);
    --faint: rgba(28, 27, 24, 0.32);
    --line: rgba(28, 27, 24, 0.22);
    --accent: #b4543e;
}

body.dark {
    --bg: #0d0d0f;
    --ink: #e9e7e2;
    --muted: rgba(233, 231, 226, 0.55);
    --faint: rgba(233, 231, 226, 0.32);
    --line: rgba(233, 231, 226, 0.18);
    --accent: #ce624c;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
    overflow: hidden;
    transition: background-color 0.5s ease, color 0.5s ease;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--accent);
    color: var(--bg);
}

/* ============================================================
   The frame — inset rectangle with text running along its edges
   ============================================================ */

.frame {
    position: fixed;
    inset: var(--frame-inset);
    pointer-events: none;
    z-index: 50;
}

.frame-border {
    position: absolute;
    inset: 0;
    border: 1px solid var(--line);
    transition: border-color 0.5s ease;
    animation: frame-draw 1.1s var(--ease) both;
}

@keyframes frame-draw {
    from { clip-path: inset(50% 50% 50% 50%); opacity: 0; }
    to   { clip-path: inset(0 0 0 0); opacity: 1; }
}

/* corner ticks */
.frame-corner {
    position: absolute;
    width: 9px;
    height: 9px;
    color: var(--faint);
    transition: color 0.5s ease;
    animation: label-in 0.8s var(--ease) 0.9s both;
}

.frame-corner::before,
.frame-corner::after {
    content: '';
    position: absolute;
    background: currentColor;
}

.frame-corner::before { left: 4px; top: 0; width: 1px; height: 9px; }
.frame-corner::after  { left: 0; top: 4px; width: 9px; height: 1px; }

.frame-corner.tl { top: -5px; left: -5px; }
.frame-corner.tr { top: -5px; right: -5px; }
.frame-corner.bl { bottom: -5px; left: -5px; }
.frame-corner.br { bottom: -5px; right: -5px; }

/* labels sitting on the frame line, interrupting it */
.frame-label {
    position: absolute;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--muted);
    background: var(--bg);
    padding: 0 10px;
    white-space: nowrap;
    transition: color 0.5s ease, background-color 0.5s ease;
    animation: label-in 0.8s var(--ease) both;
}

@keyframes label-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.frame-label.tl { top: -9px; left: 22px; animation-delay: 0.7s; }
.frame-label.tr { top: -9px; right: 22px; animation-delay: 0.8s; }
.frame-label.bl { bottom: -9px; left: 22px; animation-delay: 0.9s; }
.frame-label.br { bottom: -9px; right: 22px; animation-delay: 1.0s; }

.frame-label.left,
.frame-label.right {
    writing-mode: vertical-rl;
    padding: 10px 0;
    top: 50%;
    translate: 0 -50%;
}

.frame-label.left {
    left: -9px;
    rotate: 180deg;
    animation-delay: 1.1s;
}

.frame-label.right {
    right: -9px;
    animation-delay: 1.2s;
}

.frame-label .accent {
    color: var(--accent);
}

/* ============================================================
   Navigation
   ============================================================ */

.navbar {
    position: fixed;
    top: calc(var(--frame-inset) + var(--frame-pad));
    left: calc(var(--frame-inset) + var(--frame-pad));
    right: calc(var(--frame-inset) + var(--frame-pad));
    z-index: 100;
    animation: rise-in 0.9s var(--ease) 0.3s both;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.logo {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.3rem;
    color: var(--ink);
    text-decoration: none;
    transition: color 0.3s ease;
    pointer-events: auto;
}

.logo:hover {
    color: var(--accent);
}

.nav-items {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-item {
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: lowercase;
    color: var(--muted);
    padding: 4px 0;
    position: relative;
    transition: color 0.3s ease;
}

.nav-item .nav-num {
    font-size: 8px;
    vertical-align: super;
    margin-right: 4px;
    color: var(--faint);
    transition: color 0.3s ease;
}

.nav-item::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 1px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.4s var(--ease);
}

.nav-item:hover,
.nav-item.active {
    color: var(--ink);
}

.nav-item:hover .nav-num,
.nav-item.active .nav-num {
    color: var(--accent);
}

.nav-item.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--line);
    border-radius: 50%;
    width: 22px;
    height: 22px;
    cursor: pointer;
    position: relative;
    transition: border-color 0.3s ease;
    align-self: center;
}

.theme-toggle::before {
    content: '';
    position: absolute;
    inset: 4px;
    border-radius: 50%;
    background: var(--ink);
    clip-path: inset(0 50% 0 0);
    transition: background-color 0.5s ease;
}

.theme-toggle:hover {
    border-color: var(--accent);
}

/* ============================================================
   Sections
   ============================================================ */

.main-container {
    position: fixed;
    inset: calc(var(--frame-inset) + var(--frame-pad) + 50px)
           calc(var(--frame-inset) + var(--frame-pad))
           calc(var(--frame-inset) + var(--frame-pad) + 34px);
}

.content-section {
    position: absolute;
    inset: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(14px);
    transition: opacity 0.55s var(--ease), transform 0.55s var(--ease), visibility 0s 0.55s;
    overflow-y: auto;
    scrollbar-width: none;
    /* dissolve overflowing text at the bottom instead of hard-clipping */
    mask-image: linear-gradient(to bottom, black calc(100% - 56px), transparent);
    -webkit-mask-image: linear-gradient(to bottom, black calc(100% - 56px), transparent);
}

.content-section::-webkit-scrollbar {
    display: none;
}

.content-section.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition: opacity 0.55s var(--ease) 0.15s, transform 0.55s var(--ease) 0.15s, visibility 0s;
}

.section-content {
    max-width: 760px;
    margin: 0 auto;
    padding: 2vh 8px 72px;
}

@keyframes rise-in {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

.section-title {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(2.2rem, 5.5vw, 3.6rem);
    line-height: 1.1;
    letter-spacing: -0.01em;
    margin-bottom: 2.4rem;
}

.section-title .kicker {
    display: block;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1.1rem;
}

/* about */
.about-text p {
    font-family: var(--font-display);
    font-size: 1.12rem;
    line-height: 1.8;
    color: var(--ink);
    margin-bottom: 1.4rem;
    max-width: 64ch;
}

.about-text p.lede::first-letter {
    font-size: 1.6em;
    line-height: 1;
}

.about-text a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid currentColor;
    transition: opacity 0.3s ease;
}

.about-text a:hover {
    opacity: 0.7;
}

/* ============================================================
   Index lists (projects / writing)
   ============================================================ */

.index-list {
    list-style: none;
}

.index-item a {
    display: block;
    padding: 1.15rem 0.2rem;
    text-decoration: none;
    color: var(--ink);
    border-bottom: 1px solid var(--line);
    transition: padding-left 0.4s var(--ease);
}

.index-row {
    display: flex;
    align-items: baseline;
    gap: 1.2rem;
}

.index-item:first-child a {
    border-top: 1px solid var(--line);
}

.index-num {
    font-size: 9px;
    letter-spacing: 0.15em;
    color: var(--faint);
    transition: color 0.3s ease;
}

.index-title {
    font-family: var(--font-display);
    font-size: 1.35rem;
    line-height: 1.25;
    transition: color 0.3s ease;
}

.index-rule {
    flex: 1;
    border-bottom: 1px dotted var(--faint);
    translate: 0 -4px;
    min-width: 30px;
}

.index-date {
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
    white-space: nowrap;
}

.index-item a:hover {
    padding-left: 0.9rem;
}

.index-item a:hover .index-title {
    color: var(--accent);
}

.index-item a:hover .index-num {
    color: var(--accent);
}

.index-blurb {
    display: block;
    font-size: 11px;
    font-family: var(--font-mono);
    color: var(--muted);
    max-width: 58ch;
    line-height: 1.7;
    padding: 0.55rem 0 0 2.1rem;
}

/* on hover-capable devices, blurbs are tucked away until the row is hovered */
@media (hover: hover) {
    .index-blurb {
        opacity: 0;
        max-height: 0;
        overflow: hidden;
        padding-top: 0;
        transition: opacity 0.4s var(--ease), max-height 0.4s var(--ease), padding-top 0.4s var(--ease);
    }

    .index-item:hover .index-blurb {
        opacity: 1;
        max-height: 90px;
        padding-top: 0.55rem;
    }
}

/* ============================================================
   Social links — bottom edge, text style
   ============================================================ */

.social-links {
    position: fixed;
    bottom: calc(var(--frame-inset) + 14px);
    left: 50%;
    translate: -50% 0;
    display: flex;
    gap: 2.2rem;
    z-index: 60;
    animation: rise-in 0.9s var(--ease) 1s both;
}

.social-link {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.3s ease;
}

.social-link:hover {
    color: var(--accent);
}

/* ============================================================
   Modal
   ============================================================ */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0s 0.4s;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.4s ease, visibility 0s;
}

.modal-container {
    position: relative;
    width: min(680px, calc(100vw - 2 * var(--frame-inset) - 32px));
    max-height: calc(100vh - 2 * var(--frame-inset) - 48px);
    background: var(--bg);
    border: 1px solid var(--line);
    padding: 3rem 3rem 2.4rem;
    overflow-y: auto;
    scrollbar-width: none;
    transform: translateY(18px);
    transition: transform 0.45s var(--ease);
}

.modal-container::-webkit-scrollbar {
    display: none;
}

.modal-overlay.active .modal-container {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 14px;
    right: 14px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--muted);
    padding: 6px;
    transition: color 0.3s ease, rotate 0.4s var(--ease);
}

.modal-close:hover {
    color: var(--accent);
    rotate: 90deg;
}

.modal-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1.5rem;
    border-bottom: 1px solid var(--line);
    padding-bottom: 1.2rem;
    margin-bottom: 1.6rem;
}

.modal-title {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 1.9rem;
    line-height: 1.15;
}

.modal-date {
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--muted);
    white-space: nowrap;
}

.modal-description p {
    font-family: var(--font-display);
    font-size: 1.05rem;
    line-height: 1.75;
    margin-bottom: 1rem;
}

.modal-tech-stack {
    margin-top: 1.6rem;
}

.modal-tech-stack h3,
.modal-media h3 {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 9px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.8rem;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.1rem;
}

.tech-tag {
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--muted);
}

.tech-tag::before { content: '[ '; color: var(--faint); }
.tech-tag::after  { content: ' ]'; color: var(--faint); }

.modal-media {
    margin-top: 1.8rem;
}

.media-carousel {
    position: relative;
    overflow: hidden;
}

.carousel-items {
    display: flex;
    transition: transform 0.5s var(--ease);
}

.carousel-item {
    flex: 0 0 100%;
    position: relative;
}

.carousel-item img {
    width: 100%;
    display: block;
    border: 1px solid var(--line);
}

.carousel-item iframe {
    width: 100%;
    height: 320px;
    border: 1px solid var(--line);
    background: var(--bg);
}

.media-link-preview {
    display: block;
    position: relative;
}

.iframe-skeleton {
    position: absolute;
    inset: 0;
    background: var(--line);
    animation: pulse 1.4s ease-in-out infinite;
}

.iframe-skeleton.loaded {
    display: none;
}

@keyframes pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.15; }
}

.carousel-controls {
    display: flex;
    justify-content: center;
    gap: 0.6rem;
    margin-top: 0.9rem;
}

.carousel-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    border: 1px solid var(--muted);
    background: none;
    cursor: pointer;
    padding: 0;
}

.carousel-dot.active {
    background: var(--accent);
    border-color: var(--accent);
}

.modal-footer {
    display: flex;
    gap: 2rem;
    margin-top: 2.2rem;
    padding-top: 1.4rem;
    border-top: 1px solid var(--line);
}

.modal-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--ink);
    text-decoration: none;
    transition: color 0.3s ease;
}

.modal-button svg {
    width: 14px;
    height: 14px;
}

.modal-button:hover {
    color: var(--accent);
}

.modal-button.hidden {
    display: none;
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 720px) {
    :root {
        --frame-inset: 10px;
        --frame-pad: 18px;
    }

    .frame-label.left,
    .frame-label.right,
    .frame-label.tr {
        display: none;
    }

    .nav-items {
        gap: 1.1rem;
    }

    .nav-item {
        font-size: 10px;
        letter-spacing: 0.08em;
    }

    .nav-item .nav-num {
        display: none;
    }

    .logo {
        font-size: 1.1rem;
    }

    .main-container {
        inset: calc(var(--frame-inset) + var(--frame-pad) + 44px)
               calc(var(--frame-inset) + var(--frame-pad))
               calc(var(--frame-inset) + var(--frame-pad) + 30px);
    }

    .index-title {
        font-size: 1.1rem;
    }

    .index-rule {
        min-width: 12px;
    }

    .modal-container {
        padding: 2.2rem 1.4rem 1.8rem;
    }

    .social-links {
        gap: 1.4rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-delay: 0s !important;
        transition-duration: 0.01ms !important;
    }
}